Carburetor for internal-combustion engines



April 22, 1930. L. M. WO-OLSON 1,755,943

CARBURETOR FOR INTERNAL COMBUSTION ENGINES Filed Sept. 19, 1925 ammo/114504,

Lionel M. Woo/son trial), STATES PATENT LIONEL M. 'WOOLSON,-OF DETROIT, MICHIGAN, .A SSIGNOR TO PACKARD MOTOR CAR COMPANY, OF, DETROIT, MICHIGAN, A CORPORATION OF MICHIGAN CABBUBETOR FOR INTERNAL-COMBUSTION ENGINES Applicationflled September 19, 1925. Serial No. 57,259.

This invention relates to internal combustion engines, and particularly to the carburetor mechanism thereof.

In the use of internal combustion engines in airplanes, it is desirable that the carburetor mechanism should operate efliciently at various inclinations of the plane or engine. The

conventional float chamber mechanism of a carburetor operates Well enough at slight inclinations, but there is usually no provision for operating as efliciently at steeper inclination or in an inverted position for any length of time.

It is one of the objects of the present invention that a carburetor mechanism be provided that will operate as efliciently on a steep climb or a steep descent as on a level. 7

Another object of the invention is to provide a carburetor mechanism that will operate efficiently in an airplane steeply banked on one side or the other.

Another object of the invention is to provide a carburetor mechanism that will maintain its level in an inverted position as well as in a normal position.-

Another object of the invention is to provide a simple and eflicient float mechanism for acarburetor for airplane engines or for other use. Other objects of the invention will appear from the following description taken in connection with the drawings, which form a part ofthisspecification, and in which Fig. 1 is a vertical section through a carburetor embodyingtheinvention,

' Fig.2 is'aslightly enlarged vertical section online 22 of Fig.1, I

1 Fig. 3 is an enlarged perspective view of the float guiding means, and

Fig. 4 is another perspective view of the guide for the float. I

Referring to the drawings, 10 represents the intake pipe of an internal combustion engine, 5 and -11 is the usual butterfly throttle valve therein. 12 is a lower continuation of the intake pipe and forms the mixing chamber of the carburetor of this invention.

In-the chamber-12 is a Venturi tube 60 13 connected to the main air intake pipe 14 of the carburetor, and 15 is a choke valve in the latter pipe.

Extending into the Venturi tube 13 is the fuel nozzle 16 of the carburetor, the upper end 17 of which fuel nozzle is arranged in the more contracted part of the Venturi tube 13.

The float chamber mechanism of the carburetor is indicated generally by the numeral 18, and it will be noted instead of mounting this chamber low down on the carburetor, it is supported at a point justa little below the outlet or upper end 17 of the nozzle 16. Thus the float chamber mechanism 18 has an outlet 19 which is connected through a conduit 20 with the lower end of the fuel nozzle 16, so that the float chamber mechanism may supply liquid fuel to said nozzle.

The float chamber mechanism, as shown herein, comprises a substantially cylindrical.

The inlet 23 and outlet 19, beside'sbeing arranged on the axis of the float chamber, are also extended inwardly toward the center of the chamber in the form of tubes 25 and 26 respectively.

The inlet 23 is controlled by a valve 27 hav ing a spring 28 which tends to keep it open,

and the valve is controlled by afloat 29 arranged in the chamber and provided with a device-30 havi g a. cam surface 31 which opcrates against the head of the valve 27. The float 29 is preferably of horseshoe-shape, as shown particularly in Figs. 1 and 2, and the part,or device30, is connected to it so that it depends on the inner part of the horseshoe. This horseshoe-shape permits the float to partly surround the inlet and outlet tubes 25 and 26, andjo turn relative to those tubes and always maintain an upright position in-the chamber.

The float is guided in its movements b a guide member 32 having a shank 33 extending into the outlet tube 26. The guide 32 has flanges- 34 between which the device 30 of the float operates. Thus, as the float moves up, it carries with it the device 30, and the cam sur-.

face 31 operates against the valve 27 toclose the latter. As the float moves down, the valve 27 will be opened by the spring 28. If the float chamber is moved around its axis, "the float will stay in an upright position, and the m guide 32 will oscillate relative to-the outlet tube 26. In order that the guide may not interfere with the outlet, its s ank 33 is hollow and is provided with a slot 35 which registers with several openings or notches 36 1n the inner end of the tube 26.

From the above description, it will be seen that the float chamber 21 may be turned about its axis into any position, even in an inverted position, and the float 29 will still opstate perfectly'to control the levelof liquid therein. The float chamber may, also, be tiltj ed to one side or the other to a limited degree,

three or four pounds of fuel pressure is supplied to the pipe 24, but if a lower pressure is to be used, it may be desirable to make a very small vent in the normally upper part of the float chamber.

While I have herein described in some detail a specific embodiment of my invention,

which I deem tobe new and advantageous and outlet arranged adjacent the center of the may specifically claim, I do not desire it to be understood that my invention is limited to the exact details of the construction, asit will be apparent that changes may be made therein without departing from the spirit or scope of m invention.

ving thus described my invention, what I claim anddesire to secure by Letters Patent is: 1. A carburetor float mechanism comprising a chamber having an inlet and an outlet, a valve for the inlet, and a vertically rotatable float for controlling said valve. 2. A carburetorfloat mechanism comprising a chamber having an inlet and an outlet, a float in said chamber, a valve for said inlet,

and means connected. to'said float and arranged in said outlet forcontrolling said valve. 1 4 3. A carburetor float mechanism comprising a float chamber having an inlet, and an chamber, a valve for the inlet, and a float in the chamber for controlling said valve.

4. A carburetor float mechanism 'comprising a float chamber havinganinlet and an outlet arranged adjacent the center of the chamber, a valve for the inlet, and a horse- I shoe-shaped float in the chamber for controlling said valve.

- J In testimony whereof I 5. In a carburetor, a float chamber, a valve for the inlet thereto, a float in said chamber for controlling said valve, and a pivoted guide for said float.

c 6. In a carburetor, a .float chamber, a valve for the inlet thereto, a float in said chamber for controlling said valve, and a guide for said float adapted to rock with the various inclinations of the carburetor.

7. A carburetor float mechanism comprising a horseshoe-shaped float, a valve actuatin cam operated by said float, and a pivoted guide for said cam."

8. In a carburetorfloat mechanism, the

combination of a substantially cylindrical chamber, a float in said chamber, and a guide for said float pivotally supported substantially on the axis of the chamber.

9. In a carburetor float mechanism, the combination of a horizontally disposed substantially cylindrical chamber having an inlet substantially in the axis thereof, a float in said chamber and a valve for said inlet controlledby said float.

10. A carburetor float mechanism comprising a substantially cylindrical float chamber having its inlet and its outlet adjacent the axis of the chamber, a valve for the inlet, a float to control said valve, and a guide for said float pivotally supported adjacent the axis of said chamber. v

11. A carburetor float mechanism comprising a chamber having its inlet and its outlet adjacent the center of the chamber, a valve for the inlet, a guide pivoted in the outlet, and

a float in thechamber moving in said guide gardless of the position of said chamber about the axis of said chamber.

13. A carburetor float mechanism comprisinga chamber, an inlet tube extending from one side of said chamber towards the center thereof, an'outlet tube extending from adjacent the center of said chamber, a valve for said inlet tube, a guide mounted to oscillate insaid outlet tube, a float in said chamber and a device on said floatoperating in said guide and having a cam surfacefor controlling said valve.

afiixm signature. LIONELM. WgOLSON. 

